缓释氮肥对江苏水稻产量及肥料利用率的影响OA

This study aims to clarify the yield-increasing and efficiency-improving effects of slow-release nitrogen fertilizer in rice fields of Jiangsu Province,providing theoretical basis for reducing fertilizer application while increasing rice production in this region.A total of five treatments with respective basal dressing and top dressing were set up in the study,including ordinary urea+ordinary urea(T1),ordinary compound fertilizer+ordinary urea(T2),ordinary urea+slow-release urea(T3),slow-release urea+ordinary urea(T4),and slow-release urea+slow-release urea(T5).We examined the effects of different treatments on soil physicochemical properties,rice yield,and fertilizer utilization efficiency,using'Nanjing 5718'as the test variety.The results indicated that applying slow-release nitrogen fertilizer significantly increased the content of total N and alkali-hydrolyzable N in the soil and improved the chlorophyll content and plant height of rice,thereby improving crop yield and N fertilizer utilization efficiency.The optimal treatment was T5,which applied slow-release N fertilizer to both basal dressing and topdressing,contributing to rice yield of 9562.01 kg/hm2 and N fertilizer utilization efficiency of 45.48%.The values were 25.1%and 20.3%higher than those with only ordinary urea(T1),and 23.3%and 22.4%higher than those with compound fertilizer+ordinary urea(T2),respectively.All the results indicated that slow-release nitrogen fertilizer had significant yield-increasing and efficiency-improving potential in rice production in Jiangsu.